What should be frequently checked when wearing SCBA in an IDLH atmosphere?

When wearing a Self-Contained Breathing Apparatus (SCBA) in an Immediately Dangerous to Life or Health (IDLH) atmosphere, one of the most critical aspects to check frequently is the air supply status. This is essential because the air supply is the primary lifeline for a firefighter in such hazardous conditions. Ensuring that an adequate supply of breathable air is available is vital for maintaining safety and avoiding asphyxiation or other life-threatening conditions.

In IDLH situations, the potential for rapidly changing environments necessitates that firefighters regularly monitor their air supply gauge. This allows them to make informed decisions, such as when to exit the hazardous area or if they need to use buddy breathing techniques in an emergency. The air supply also dictates the duration a firefighter can remain in the danger zone, affecting overall mission planning and execution.

While other factors, such as equipment temperature, rescue team location, and exposure limits are also important considerations, none are as immediately critical to survival as the status of the air supply when operating in an environment where the air quality poses a direct threat to life. Regular checks of the air supply help ensure that the firefighter can make it back to safety before running out of breathable air.